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Details for Benchmark: NE0628

N 42° 18.850 W 083° 04.517 (NAD 83)

Altitude: 586.84

Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)

Location:
In WAYNE county, MI View Original Datasheet
Designation:
D 7
Marker Type:
survey disk
Setting:
massive structures with deep foundations
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

01/01/1932 by USLS (MONUMENTED)
01/01/1970 by USLS (GOOD)
DESCRIBED BY US LAKE SURVEY 1970 IN DETROIT. D 7 IS IN THE SOUTHWEST PART OF DETROIT, WAYNE COUNTY, MICHIGAN, UNDER AMBASSADOR BRIDGE, APPROXIMATELY 70 FEET FROM SEAWALL ALONG THE DETROIT RIVER, ON EAST SIDE OF WEST ABUTMENT OF TOWER OF THE BRIDGE, 2 FEET ABOVE THE GROUND, BEING HORIZONTAL LINE OF CROSS ON BRONZE DISC SET INTO THE CONCRETE. NOTE-- PREV. DESIG. BM 07 1932.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 IN DETROIT, UNDER THE AMBASSADOR BRIDGE SET VERTICALLY IN THE NORTHEAST FACE OF THE ROUND CONCRETE FOUNDATION OF THE SOUTHWEST ONE OF TWO STEEL PIERS, 21.3 METERS (70.0 FEET) NORTHWEST OF THE SEAWALL. THE MARK IS 0.3 M ABOVE GROUND.
01/01/1983 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1983 RECOVERED IN GOOD CONDITION.
01/01/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION. ADD--245.7 M (806.1 FT) SOUTHEAST OF THE CENTER OF JEFFERSON AVENUE, AND 17.9 M (58.7 FT) SOUTHWEST OF THE EXTENDED CENTER OF 21ST STREET.
01/01/1986 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1986 (PCJ) RECOVERED IN GOOD CONDITION.
01/04/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 RECOVERED IN GOOD CONDITION.
09/25/1999 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1999 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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